A fragile truce reached this week between the Syrian government and Kurdish-led fighters was seen as a blow by many Kurds in their hard-won fight for autonomy.

The huge al-Hol camp in northeastern Syria for years has posed an intractable problem — a destitute and increasingly dangerous detention site where ISIS ideology lives on.

Questions have emerged over the fate of thousands of Islamic State prisoners in northeastern Syria after government forces seized swaths of territory long controlled by Kurdish forces who had been guarding the prisons.

ISIS prisoners escaped from a northeastern Syria prison, and some remain unaccounted for after chaos made tracking impossible, according to Syria analyst Nanar Hawach.

The Kurdish-led Syrian Democratic Forces said that it asked for help from a U.S. coalition base but that it "did not intervene, despite repeated calls for intervention."

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The safe pasage decision comes as U.S. troops have elevated security concerns as they transport some 7,000 ISIS prisoners from Syria to Iraq, a highly complex operation. CENTCOM has carried out three waves of attacks against ISIS leaders in the wake of the deadly ambush, called Operation Hawkeye Strike, and U.S. officials are wary of retaliation.

"We've requested and demanded guarantees, but as always, the U.S. does not give any," the SDF's political co-chair told Newsweek.